/*
 * QtWebKit-powered headless test runner using PhantomJS
 *
 * PhantomJS binaries: http://phantomjs.org/download.html
 * Requires PhantomJS 1.6+ (1.7+ recommended)
 *
 * Run with:
 *   phantomjs runner.js [url-of-your-qunit-testsuite]
 *
 * e.g.
 *   phantomjs runner.js http://localhost/qunit/test/index.html
 */

/*jshint latedef:false */
/*global phantom:false, require:false, console:false, window:false, QUnit:false */

(function () {
  'use strict';

  var args = require('system').args;

  // arg[0]: scriptName, args[1...]: arguments
  if (args.length !== 2) {
    console.error('Usage:\n  phantomjs runner.js [url-of-your-qunit-testsuite]');
    phantom.exit(1);
  }

  var url = args[1],
      page = require('webpage').create();

  // Route `console.log()` calls from within the Page context to the main Phantom context (i.e. current `this`)
  page.onConsoleMessage = function (msg) {
    console.log(msg);
  };

  page.onInitialized = function () {
    page.evaluate(addLogging);
  };

  page.onCallback = function (message) {
    var result,
        failed;

    if (message) {
      if (message.name === 'QUnit.done') {
        result = message.data;
        failed = !result || result.failed;

        phantom.exit(failed ? 1 : 0);
      }
    }
  };

  page.open(url, function (status) {
    if (status !== 'success') {
      console.error('Unable to access network: ' + status);
      phantom.exit(1);
    } else {
      // Cannot do this verification with the 'DOMContentLoaded' handler because it
      // will be too late to attach it if a page does not have any script tags.
      var qunitMissing = page.evaluate(function () {
        return (typeof QUnit === 'undefined' || !QUnit);
      });
      if (qunitMissing) {
        console.error('The `QUnit` object is not present on this page.');
        phantom.exit(1);
      }

      // Do nothing... the callback mechanism will handle everything!
    }
  });

  function addLogging() {
    window.document.addEventListener('DOMContentLoaded', function () {
      var current_test_assertions = [];

      QUnit.log(function (details) {
        var response;

        // Ignore passing assertions
        if (details.result) {
          return;
        }

        response = details.message || '';

        if (typeof details.expected !== 'undefined') {
          if (response) {
            response += ', ';
          }

          response += 'expected: ' + details.expected + ', but was: ' + details.actual;
          if (details.source) {
            response += "\n" + details.source;
          }
        }

        current_test_assertions.push('Failed assertion: ' + response);
      });

      QUnit.testDone(function (result) {
        var i,
            len,
            name = result.module + ': ' + result.name;

        if (result.failed) {
          console.log('Test failed: ' + name);

          for (i = 0, len = current_test_assertions.length; i < len; i++) {
            console.log('    ' + current_test_assertions[i]);
          }
        }

        current_test_assertions.length = 0;
      });

      QUnit.done(function (result) {
        console.log('Took ' + result.runtime + 'ms to run ' + result.total + ' tests. ' + result.passed + ' passed, ' + result.failed + ' failed.');

        if (typeof window.callPhantom === 'function') {
          window.callPhantom({
            'name': 'QUnit.done',
            'data': result
          });
        }
      });
    }, false);
  }
})();